portable heat meter - calec

7/29/2019 Portable Heat Meter - CALEC

1/12VD3-180e02.2010

ApplicationTop quality heat and cooling meters for heating, air-conditioning, cooling and solar energy plants can be realised with the

CALEC ST energy calculator. The modular unit distinguishes itself by its long-term stability. Flexible communications makes

it particularly interesting for integration into building management systems.

Customer advantages Precise energy measurement for all thermal applica-

tions in buildings engineering

Measurement of "heating and cooling" in a single

unit

Use in cooling and solar heating systems

Choice of power supplies

Re-calibration saves process costs

Supports operation monitoring

Expandable on modular basis

Optimum LON system integration

Added logistical value thanks to optional on-site pro-

gramming of pulse value and installation site of flow

sensor (INIT mode)

CALEC ST

Multi-protocol heating and

cooling energy calculator

Characteristics Precise measurement of thermal energy for heating,

cooling and combined heating/cooling plants

Interfaces to building control systems:

M-Bus, LON, Modbus, N2Open

Plug-in calculator module

Data for standard cooling media with variable

properties

Integrated power supply for flow sensor

Up to 2 pulse in-/outputs or 2 analogue outputs

Metrological approval in accordance with

2004/22/EC (MID) and PTB K7.2 (cold, heat/cold

combined)


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Application

The CALEC ST is used for energy metering in split configuration with passive impulse-generating volume-measuring elements and P t100

or Pt 500 temperature sensors in two- or four-wire version. In most cases, CALEC ST is used with the following volume-measuring ele-

ments:

Multibeam meters in the range Qp 0,6 - 10 m

3

/h Hydrometric vane in the range Qp 15 - 600 m3/h

Static volume-measuring elements up to Qp 0.6 - 6000 m3/h

Choose from our wide range of volume-measuring elements. Our advisers will be pleased to help you select the right ones for your needs.

Obligatory calibration and type-approvalIn most countries energy metering systems used for commercial purposes are subject to compulsory verification. The devices comprising

the metering system must all possess official pattern approval. CALEC ST has been approved according to both the european Measu-

ring Instruments Directive 2004/22/EG and the German PTB K 7.2 directive for cooling meters.

Officially verified heat meters must be reverified before the verification period has expired. The operator is responsible for compliance with

this requirement. (Re-)Verification includes all parts (temperature and flow sensors, calculator) forming the complete heat meter. The plug-in calculator module considerably reduces the cost of reverification since there are no wires to be disconnected.

For testing and reverification purposes a high resolution display mode as well as CALEC Win K are avaiable.

New: Commissioning of officially verified devices is even easier as both the pulse value and the installation side can now be programm-

ed in situ (INIT-Mode).

Basic function and measuring principleA so-called combined heat meter requires the following individual devices:

Electronic energy calculating device

Flow sensor

with pulse generator

Supply

Return

Temperature sensors

installed in the supply

and return pipelines


3/123

The thermal output (P) of a pipe-conduit network is based on a measurement of the flow temperature, return-flow temperature and volu-

me flow of the heat transfer medium.

P = Volume rate of flow x (T heat side - T cold side) x k

T heat side: For heating, flow temperature, for cooling, return temperature

T cold side: For heating, return temperature, for cooling, flow temperaturek: Heat coefficient (function considering temperature and pressure-related characteristics of the heat carrier)

Energy can be determined by integration of output. The formula shows that, in order to meter energy, the specific heat and density of the

heat transfer medium must be expressed in relation to the temperature of the counter mechanism. The following factors (among others)

also have a decisive influence on metering accuracy:

The static accuracy and stability of the temperature-measuring procedure

The counter cycle of the temperature-measurement system, and the volume flow used to detect dynamic factors

CALEC ST is ideally equipped for use in demanding metering tasks, thanks to:

The use for temperature-measuring purposes of a high-resolution AD converter (16 bit) designed with long-term stability in mind and

equipped with self-calibration and filter functions

Short counter-cycle (mains version: 1 s)

The ability to use high-resolution mechanical or electronic flow indicators operating at pulse frequencies of up to 200 Hz (mains version)

Flow-rate measurementThe system is compatible with all standard flow meters that work on the pulse output principle. Adjust the pulse value to the lowest pos-

sible setting if you do require continuous measurement or high-resolution energy metering.

When it is running on battery power, the CALEC ST can handle contact makers working at pulse frequencies of up to 6 Hz. The mains-

powered CALEC ST can operate with contacts makers running at up to 20 Hz and electronic transmitters (NAMUR, etc.) with pulse fre-

quencies of up to 200 Hz.

The point of installation of the flow-rate meter is of vital importance, as the volume-to-mass conversion is based on the temperature de-

tected at this point.

It is preferable to fit the flow indicator to the section of conduit where the temperature is nearest to room temperature.

Temperature measurementThe CALEC ST is fit ted with two highly-accurate temperature-measurement inputs, which are each connected to type-approved, paired

temperature sensors in two- or four-wire configuration. The planning of systems should conform to heat meter standard EN 1434, parts 2

and 6. EN 1434-4 stipulates that only sensors of the same design and length should be paired together.

The counter mechanism is available in either Pt 100 or Pt 500 configuration.

Thermal energy is measured from a temperature difference from dT above (respectively below) 0 K. The CALEC ST is the ideal solution

for air-conditioning or cooling installation when used with appropriate temperature sensors and flow meters for cooling.


4/124

Data communication

M-Bus InterfaceOn account of its standardisation (EN 13757) and features as readout bus

for building management sytems (BMS), M-Bus has been used as the

communication protocol in many instances. Advantages include: easy installation

high cost-effectiveness

multi-vendor capability.

Not only standard data such as meter readings and current values can be

read out over the M-Bus interface, but also all additional data available

from the device, for example billing and logger values. With CALEC ST

prrimary addresses and baud rates can be set with the operating keys,

eliminating the need for a PC when commissioning the system.

M-Bus is a single master bus, meaning that a slave can communicate with

only one master. If device data are to be transmitted to two M-Bus ma-

sters then this will only be possible with devices having two M-Bus inter-faces. In such cases CALEC ST can be fitted with a second M-Bus inter-

face.

LON interfaceA LON network can combine BMS and meter readout in one system. LON (Local Operating Network) is a multi-master system with intelli-

gent nodes which can use different transmission media. For CALEC ST a LON interface (FTT-10A) for transmissions over twisted pair cab-

ling is available. An outstanding feature of the LON technology is its interoperability which guarantees that the BMS remains operational

beyond the service-life of its individual components. CALEC ST is the first energy calculator to be certified according to LONMARK 3.4. This

means lower costs and reduced delivery date risks for system integration. LONMARK 3.4 certification means, among other things:

Assurance of communication functionality and data availability

Low integration costs since standard tools can be used and all features required by LONMARK

are available (object library, XIF files, ser-vice LED, service key, etc.).

Modbus RTU interfaceThe Modbus interface allows direct connection of CALEC ST to a Modbus controller. The Modbus protocol as de facto standard in control

and building management systems is widely used since it is an open protocol (www.modbus.org). It is based on a master/slave architec-

ture and allows for a simple system integration by means of a mapping table. Modbus RTU uses the physical layer of the RS485 interface.

Further information can be found in the operating instructions (Art. No. 20891).

N2Open interfaceCALEC ST can communicate directly with N2Open controllers (e. g. from the JCI company ) by means of the N2Open interface. N2Open

also uses the physical layer of the RS485 interface. Further information can be found in the operating instructions (Art. No. 20892).

Limit signal,Alarm signal,Power,Flowrate

M-Bus Masterfor remote reading

M-Bus #1

M-Bus #2 M-Bus Masterfor BMS


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Digital inputs and outputs

The CALEC ST can be fitted with two digital-signal interfaces, which can be configured - by means of a switch - as either inputs or out-

puts. These signals can be used to process counter impulses, or to warn when limit values have been exceeded, or to transmit alarm mes-

sages to the building-management system.

Limit-value signals

Digital output signals can be used to emit limit-value monitoring signals. The following parameters can be monitored in this respect:

1. Function of one-sided limit-value monitoring (Limit1)If an adjustable maximum limit is exceeded or if the reading fails to reach an adjustable minimum, the output signal switches over, hy-

steresis (0 - 10 %) and control direction are selectable as required. While the excess-reading remains in force, the meter (showing Cnt

for counter) calculates the total duration of the error for inspection purposes.

2. Function of two-sided limit-value monitoring (Limit2)

If an adjustable maximum limit is exceeded and if there is failure to reach an adjustable minimum, the functions operate in a similar way

to those of Limit1.

Alarm messageThe microprocessor monitors the temperature sensor and internal functions, and displays any resulting error messages. This information

can also be used to generate an alarm signal via the digital outputs.

Analogue outputs

CALEC ST can be equipped with two passive analogue outputs. An external power supply is required for operating purposes. The outputs

are electrically isolated from each other and from the counter mechanism. The current per channel can be adjusted within a range of 0 -

20 mA or 4 - 20 mA. The following readings can be emitted as current signals:

Additional functions

Crucial-date factorsTwo freely-programmable crucial dates (e.g. March 31st and September 30th) can be entered into the metering system and checked at

any time.

Factor Display

Temperature on hot side t-hot

Temperature on cold side t-cold

Temperature difference t-diff

Output POUEr

Flow rate FLOU

C-factor C-Factor

Density dEnSitY

Reading Display

Temperature on hot side t-hot

Temperature on cold side t-coldTemperature difference t-diff

Output POUEr

Flow rate FLOU

C-factor C-Factor

Density dEnSitY


6/126

Data logging

The CALEC ST can periodically save up to 60 data records in a circular buffer.

Simultaneous readout

In a plant with many meters, a considerable time difference between readings can occur if these are read out sequentially. CALEC ST

avoids this problem with the Freeze command. A broadcast command instructs all meters simulateneously to store the required value af-

ter which they can be read out sequentially.

Low-flow OFF function

The system is factory-adjusted to carry out an energy calculation as soon as a temperature difference of >0 (when measuring heat) or >>>

8

6

4

2

0

-2

-4

-6

-8

Heating

Cooling

1 2 3 4

en

er g

yco

ns

um

ptio

n

5 6 7 8 9 10 11 12

month

E+, V+

E-, V-


7/127

Only the heat transfer medium and concentration are established at start-up (see table):

1) Minimum temperature depends on concentration -40...0 C

2) Ethylene glycol-based

3) Propylene glycol-based

4) The above designations are the registered trademarks of their respective manufacturers.

The following graphs give an example of how the dependency of temperature on specific heat and density can have an important bearing

on the final calculation.

Solar-powered thermal systemsSolar thermal systems likewise pose demanding tasks for energy

metering with respect to temperature range and heat transfer me-

dium.

The Glycol-based heat transfer medium (GLY) option availa-

ble with CALEC ST also offers an excellent solution in these ca-

ses (further details in the section on refrigeration systems).

Medium 4) Display Concentration Temperature Manufacturer Type Application/observations

range

Antifrogen N AntifroN 20 - 60 % -120 C 1) Clariant E 2) Confirms to DIN 4757-1; toxicity

class 4

For cooling, solar, heating and heat

pump systems

Low viscosity, requires lower

Antifrogen L AntifroL 20 - 60 % -120 C 1) Clariant P 3) Not harmful to health

For pharma-sector, food use

Tyfocor Tyfocor 20 - 60 % -120 C 1) Tyfocor E See type E

Tyfocor-L TyfocorL 20 - 60 % -120 C 1) Chemie P See type P

DowCal 10 DOUCAL10 30 - 70 % -120 C 1) Dow E See type E

DowCal 20 DOUCAL20 30 - 70 % -120 C 1) Dow E See type E

Glythermin P44 GLYTHP44 40 - 80 % -100 C 1) BASF P FDA-approved in USA, corrosion

protection less effective

For pharma-sector and food-

production plants

Temper -10 TEMPER10 100 % fixed -10...150 C Temper S Ready-to-use saline solutionTemper -20 TEMPER20 100 % fixed -20...150 C Temper S Not harmful to health, (also for

pharma and food sectors)

Biodegradable, water-protection

class 1

Temper -30 TEMPER30 100 % fixed -30...150 C Temper S Low viscosity

Temper -40 TEMPER40 100 % fixed -40...150 C Temper S High heat-transfer capacity

Solar panel

Pump

Boiler

Pump

Solar tank

Customer

coldt

hott

Temperature (C)

(kJ/kg.K

)

Temperature (C)

Density(g/cm3)

DOWCAL is a registered trademark of the Dow Chemical Company


8/12

CALEC ST FlowThe CALEC ST Flow configuration is designed for flow-rate measurement purposes. Temperature measurement (hot and cold side) is

disabled in this configuration, i.e. no temperatures are detected or displayed. CALEC ST Flow uses the accumulated pulse signals from

the flow detector to calculate the current flow-rate reading. These measurement readings can be sent to the display, the analogue outputs

and/or the M-Bus or LON interface for reading or further processing.

CALEC ST configurations

Available CALEC ST configuration variants in accordance with our country-specific price lists.

Operation

Thanks to their logically-structured functioning, all setting adjustments on the CALEC ST can be carried out locally and without the use of

additional equipment.

Multi-function display

The multi-function display shows the eight-digit meter reading, along with

symbols and short texts for user operation purposes.

The displays can be selected using two buttons during operation or

when the housing is closed:

Operating buttons

Under the cover, and thus protected by the lead seal, is the Service but-

ton, which allows additional service information to be displayed and ad-

justments to be carried out.

Service button

Professional installers have the PC software CALEC Win K at their disposal (available for download from our website), which provides ef-

fective support for initial start-up, data analysis and order specifications.

Flow indication

Memory

Alarm indication

Places after the

decimal point

8 character decimal field

Edit mode

Service mode

User mode

UnitsIdentification

8


9/12

The following graph shows the information available at various points on the main operating flowchart, along with the short text designa-

tions of various sub-functions:

9

Display: Description:Info: Error message displayInstAnt: Current readings for temperature, output, flow rate, C-factor, densityTime: Date and time

Stich: Critical-date valuesLoGGer: Data-log memory settingsInPuts: Settings and status of signal inputsOutPuts: Settings and status of signal outputsUnitS: Measurement-unit settingsBUS: M-Bus settingsCONFIG: Further settings (e.g. for glycol-based heat transfer medium)SYStem: System data (e.g. firmware version)

H2 12345 . 678 m3*

H3 12345 . 678 m3*

ImP 100 L *

Sid cold

INFO

Segmenttest

H2 12 . 345678 m3 *

inStAnt

tIME

Stich

LOGGEr

InPutS

OutPutS

UnitS

BUS

6

CONFIG

SYStEM

2

3

4

5

7

8

9

10

11

1

CALEC ST BDE:

V-

E-

V+

E+

CALEC ST FLOW:

H1

Installation side

12

H3 12 . 345678 m3 *

12

Edit

Edit

E 12345 678 kWh*

E 12345.678 kWh*

12

EditProg

V 12345 678 m3*

V 12345 .678 m3*

12Edit

Prog

M 12345 678 t*

M 12345 .678 t*

12

EditProg

CALEC ST Masse

0

T1 12345678 kWh

T2 12345678 kWh

CALEC ST TGR:


10/1210

Plug-in calculator module

The energy calculator is housed in a plug-in module. The bottom of the housing (which contains the field wiring) does not have to be re-

moved when recalibrating the unit. Furthermore, device-specific data are retained in the configuration memory (EEPROM) in the bottom of

the housing (except parameters that are subject to calibration, like impulse value and installation side).

Housing, dimensions

Housing

Lower section with connection terminals, computer module and cover

Installation

DIN-standard rail or three-point attachment directly to the wall

Electrical connections

The wiring layout used depends on device configuration and applicable options. The factory-configured state of the unit is shown on the di-

agram attached to the inside of the housing cover.

Battery-powered version Mains-powered version (with M-Bus and low-voltage supply)

(Example) (Example)


11/1211

Approval permits

European approval according to the Measurement Instruments Directive (MID) 2004/22/EG, CH-MI004-07001-00

Pattern approval 22.75/08.02 as cooling meter according to PTB K7.2

Technical data and standards

The following tables contain information on standards and technical data on the available functions. For possible combinations of func-

tions refer to the price list.

Housing and operating conditions

Dimensions B x H x T = 120 x 163 x 49 mm

Ambient temperature +5...+55 C, EN 1434 class C

Storage temperature 0...60 C

Optical interface IEC 870-5, M-Bus protocol

Battery-powered version

Power supply 3 V lithium battery, service life >6 years at ambient temperature of 8 ms, pause >80 ms, max. 10 Hz

With symmetrical impulse signal, max. 6 Hz

Mains version

Power supply 230 VAC 10 % 50/60 Hz, 0.35 ms, pause >2.5 ms, max. 200 Hz

Additional functions

Adjustable temperature difference cutoff Function to suppress energy calculation if the temperature differential is too little,

(SMU) T SMU adjustable 0 to 2.99 KLimit-value monitoring Single- or two-sided, hysteresis 0 - 10

Measurement

Temperature-measurement range 0...+183 C, Type approval 5 C ... 180 C optional 2...180 C

Temperature difference 0...175 K, Type approval 3 K ... 175 K optional 2 K...178 K

Temperature sensor Pt 100 or Pt 500 paired as per IEC751, with 2- or 4-wire connection

Installation side Hot or cold

Pulse value of flow sensor 0.001 to 9999.999 liter

Pulse values and units for auxiliary inputs Volume: 0.001 to 9999.999 ml, l, m3, USGal

and contact outputs Energy: 0.001 to 9999.999 kWh, MWh, kJ, GJ, kBtu, MBtu

Error limits Better than those required for counter mechanisms conforming to EN 1434-1

Suitable for combined class-2 heat metering as per EN 1434-1 when used with

suitable volume-metering elements

Display

Display units, volume m3, USGal

Display units, energy kWh, MWh, MJ, GJ, KBtu, MBtu

Data backup in event of power failure In EERPOM >10 years

Data memory 60 data records, tracing 1 x per month, every 2 days, daily

(also hourly in mains-powered version


12/12

.5-02.2

010-Art.

Nr.11837

nderungenvorbehalten/Sousrservedemodifications

Modificationrightsreserved/Copyright

AquametroAG

Options for battery and mains versions

Pulse input / output and relay outputs

Inputs / outputs 2 pulse inputs/outputs, selectable with switches

Pulse inputs For connecting to a pulse transmitter with potental free contact or open-collector

Pulse width: 8 ms pause: 80 ms

Frequency:10 Hz (symmetric pulses

portable heat meter - calec

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